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espanolLa vegetacion higrofila efimera que ocurre en las charcas temporales de Apulia (Italia) ha sido estudiada desde el punto de vista fitosociologico. Sobre la base de 153 inventarios tomados durante el periodo 2015-2018, se identificaron 19 asociaciones, de las cuales 16 se han descrito por primera vez. Todas las asociaciones pertenecen a la clase Isoeto- Nanojuncetea . Se han identificado dos ordenes, Isoetetalia , para las comunidades con un ciclo de invierno-primavera y Nanocyperetalia , para aquellas con un ciclo de verano. Para cada asociacion estudiada se adjunta la correspondiente tabla fitosociologica. Las comunidades pertenecientes a Isoetetalia son 17 y dispuestas en cuatro alianzas ( Isoetion , Preslion cervinae , Cicendio filiformis-Solenopsion laurentiae , Agrostion salmanticae ), mientras que las de Nanocyperetalia estan incluidas en Verbenion supinae . Para resaltar las correlaciones floristicas entre las asociaciones, se procesan todos los datos relevantes utilizados para esta investigacion. En general, este analisis confirma la autonomia de las asociaciones, agrupandolas de acuerdo con el arreglo sintaxonomico propuesto por los autores. Investigaciones taxonomicas sobre la flora de estos habitats nos han llevado a la descripcion de dos nuevas subespecies de Solenopsis laurentia con distinta autoecologia EnglishThe ephemeral hygrophilous vegetation occurring in the temporary ponds of Apulia (southern Italy) was studied following the phytosociological approach. On the base of 153 phytosociological releves carried out during the period 2015- 2018, 19 associations were identified, of which 16 described for the first time. All the associations belong to the Isoeto- Nanojuncetea class. The surveyed associations can be arranged in two orders, such as Isoetetalia, including those with a winter-spring cycle and Nanocyperetalia, regarding those with a summertime cycle. The identified associations have been examined in detail, and for each one, we provided a phytosociological table. The communities belonging to the Isoetetalia are 17 and arranged in four alliances ( Isoetion , Preslion cervinae , Cicendio filiformis-Solenopsion laurentiae , Agrostion salmanticae ); instead, those ones of Nanocyperetalia are two both included in the Verbenion supinae. In order to highlight the relationships among the associations, all the releves used for this investigation are processed. Overall, this analysis confirms the autonomy of the associations, grouping them according to the syntaxonomic arrangement proposed by the authors. Taxonomic investigations on the flora occurring in these habitats allowed the detection of two new subspecies of Solenopsis laurentia , both with a different autoecology.

Linnaeus, in his protologue, provided a diagnosis under this name, citing in synonymy polynomials with illustrations from Boccone (1697: 35, t. 27) and Micheli (1729: 18, t. 14), adding "Habitat in Italia". The species is nowadays regarded as belonging to Solenopsis C. Presl. There is a sheet at LINN (Herb. Linn. No. 1051.36) which needs to be considered in connection with Lobelia laurentia. It bears the annotation "L. Laurentia" in Linnaeus's hand, together with "P" and "an minuta ? vix JES" in that of James Edward Smith, and definitely includes plants corresponding to Solenopsis laurentia as currently understood. However, it cannot be regarded as original material, since the Linnaean annotation lacks the species number from Species plantarum (i.e. 15), which means that it was almost certainly not in Linnaeus's possession until after the completion of that work. According to Savage (1945: 161), another sheet at LINN (Herb. Linn. No. 1051.35) bears as its only annotation a number 15 in Linnaeus's hand in the lower left-hand corer. However, after carefully checking the sheet we found only several blackish spots produced by an ancient fungal infection of the paper.